KR100438240B1 - Data transmitting apparatus and data transmitting method - Google Patents

Abstract

In the spreading unit 112 of the base station apparatus 100, the transmission data is spread with a low spreading rate at which it is almost impossible to obtain a predetermined signal quality after despreading in the mobile station apparatus 101, and the error detecting unit of the mobile station apparatus 101 ( In 137, when an error is detected from the data after the despreading of the received data, the base station apparatus 100 makes a request for retransmission of data, and the despreading / synthesizing unit 136 holds the data after the despreading. Thereafter, the mobile station apparatus 101 repeats the process of combining this holding data with the data after despreading which has been retransmitted until the error-free state is detected. As a result, the transmission efficiency can be improved, the transmission power can be suppressed as much as possible, and the diversity performance in the transmission by multiple antennas can be improved.

Description

DATA TRANSMITTING APPARATUS AND DATA TRANSMITTING METHOD}

Conventionally, as this kind of data transmission apparatus and a data transmission method, it is described in Unexamined-Japanese-Patent No. 1647396.

1 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus which are conventional data transmission apparatuses.

The base station apparatus 1 shown in FIG. 1 includes a buffer 10, a format converter 11, a spreader 12, a modulator 13, a variable gain amplifier 14, and a demodulator 15. ), A despreading unit 16, an error detecting unit 17, and an SIR detecting unit 18.

The output signal of the variable gain amplifier 14 is transmitted at the antenna via the circulator 19. In addition, the signal received by the antenna is output to the demodulator 15 via the circulator 19.

In addition, the mobile station apparatus 2 shown in FIG. 1 includes a buffer 30, a format converter 31, a spreader 32, a modulator 33, the variable gain amplifier 34, The roughing part 35, the despreading part 36, the error detection part 37, and the SIR detection part 38 are comprised.

The output signal of the variable gain amplifier 34 is transmitted at the antenna via the circulator 39. In addition, the signal received by the antenna is output to the demodulator 35 via the circulator 39.

In this configuration, when data is transmitted from the base station apparatus 1 to the mobile station apparatus 2, it is buffered in the buffer 10 and then formatted in a predetermined format by the format converting section 11, and spreading section 12 Spreads from). The diffusion rate in this diffusion section 12 is determined at the time of assigning the channel, and then fixed.

The spread data is modulated by the modulator 13, amplified by the variable gain amplifier 14, and transmitted from the antenna via the circulator 19.

This transmission signal is received at the antenna of the mobile station apparatus 2, input to the demodulator 35 via the circulator 39, and demodulated here, and then despread by the despreader 36. This results in reception data.

In such a reception, the SIR detection unit 38 outputs a TPC command (transmission power control signal) requesting the level increase or decrease to the transmitting side in accordance with the reception level.

In addition, the error detection unit 37 outputs a retransmission request signal when an error is detected from the error detection bit of the received data.

The TPC command and the retransmission request signal are transmitted to the base station apparatus 1 via the format conversion unit 31.

When the level increase / decrease request is made by the TPC command, the despreader 16 of the base station apparatus 1 varies the gain of the variable gain amplifier 14 as required according to the request.

When the retransmission request is made, the base station apparatus 1 that has received the retransmission request signal retransmits the transmission data.

This control is similarly performed for the base station apparatus 1 from the mobile station apparatus 2.

As described above, in the conventional data transmission method, data communication is performed at a fixed diffusion rate. That is, although the retransmission request is made, the spreading rate is fixed and the spreading rate at which the reception performance is taken at a time is used. In order to maintain the quality thereof, high-speed transmission power control is performed.

However, in the conventional apparatus, since it is a CDMA system, the effect of the accuracy of the transmission power control on the performance is large, and in particular, the control delay during fast fading becomes fatal. In other words, if the transmission power control is not executed with high precision by the TPC command, the desired quality cannot be maintained, and since the following speed is low in high speed fading, the mobile station apparatus cannot follow the mobile station apparatus, and this causes the transmission efficiency to deteriorate. There is.

This is because, in the future, in the mobile communication system, the fading fluctuation speed is also increased in connection with the increase in the use frequency band, and the deterioration becomes unnecessary more than in the present, and the processing time is long because the TPC command must be transmitted frequently. It is also expected that the transmission efficiency will deteriorate.

In addition, at a fixed spreading rate, a line with a certain condition is assumed, and a spreading rate must be determined to a certain extent. Therefore, the symbol rate cannot be increased, high-speed transmission cannot be performed, and the transmission efficiency is deteriorated.

In addition, if transmission power control is performed to maintain average quality, a user with poor line quality requires enormous transmission power, and the transmission amplifier must correspond to a large dynamic range. In addition, if the line condition is good, the transmission power can be reduced, but the average transmission power is also damaged. For example, when the probability of transmitting at half the power of the standard and the probability of transmitting at twice the power of the standard is the same, there is a problem that a larger average transmission power is always required than when transmitting at the standard transmission power. In addition, there is a problem that the dynamic area of the interference signal is increased by the transmission power control, and a dynamic area of a large demodulation system is required.

It is also possible to adaptively change the diffusion rate, but for this reason it must be delivered. In order to perform this transfer, it is difficult to estimate the optimum spreading rate, and even if it can be estimated by way of example, when a delay time for estimation is taken, it hinders high-speed communication, and when information for estimation is transmitted, Since the signal amount increases, there is a problem that the transmission efficiency is deteriorated.

In addition, in the W-CDMA system, transmission is also performed by a plurality of antennas, but there is a problem that the performance improvement as a transmission diversity is not so large even when the transmission is performed by a plurality of antennas.

The present invention relates to a mobile phone in a mobile communication system to which a Code Division Multiple Access (CDMA) method is applied, a mobile station device such as an information terminal device having a mobile phone function and a computer function, and a base station device for wireless communication with the mobile station device. It relates to a data transmission apparatus and a data transmission method applied.

1 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus which are conventional data transmission apparatuses;

2 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 1 of the present invention;

FIG. 3A is a diagram showing that the signal quality gradually increases when the line state is good;

3B is a diagram showing that the signal quality is gradually increased in the case of a poor line condition;

4 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 2 of the present invention;

5 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 3 of the present invention;

6 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 4 of the present invention;

7 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 5 of the present invention;

8 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 6 of the present invention;

9 is a block diagram showing the configuration of a despreading / synthesizing unit of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 7 of the present invention;

10 is a block diagram showing the structure of a despreading / compositing unit of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 8 of the present invention;

11 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 9 of the present invention;

12 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 10 of the present invention;

13 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 11 of the present invention;

14 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 12 of the present invention; and

Fig. 15 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 13 of the present invention.

An object of the present invention is to provide a data transmission apparatus and a data transmission method that can improve transmission efficiency, which can reliably suppress transmission power, and can improve diversity performance in transmission on a plurality of antennas. .

This object is focused on the fact that the despread data can be synthesized and the received data can be taken out when the result of the synthesis achieves a predetermined quality. The transmission is performed at a low diffusion rate, and the retransmission is repeated until the data is OK. This is achieved by synthesizing each time of retransmission to improve the quality, and consequently transmitting at the optimum diffusion rate.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described using drawing.

(Example 1)

2 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 1 of the present invention.

The base station apparatus 100 shown in FIG. 2 includes a buffer 110, a format converter 111, a spreader 112, a modulator 113, a variable gain amplifier 114, and a demodulator 115. ), A despreading / synthesizing unit 116, and an error detecting unit 117.

The output signal of the variable gain amplifier 114 is transmitted at the antenna via the circulator 119. In addition, the signal received by the antenna is output to the demodulator 115 via the circulator 119.

In addition, the mobile station apparatus 101 shown in FIG. 2 includes a buffer 130, a format converter 131, a spreader 132, a modulator 133, a variable gain amplifier 134, and a demodulator. And a despreading / synthesizing unit 136 and an error detecting unit 137. As shown in FIG.

The output signal of the variable gain amplifier 134 is transmitted at the antenna via the circulator 139. In addition, the antenna-received signal is output to the demodulator 135 via the circulator 139.

The features of the first embodiment are the diffusion section 112 (or 132), the despreading / compositing section 116 (or 136), and the error detection section 117 (or 137).

The spreader 112 spreads the transmission data at a low spreading rate (hereinafter referred to as a "low spreading rate") at which a predetermined signal quality is not obtained unless the line state is considerably good after despreading at the receiving side.

The despreading / synthesizing unit 116 demodulates the received signal and then despreads it, retains the despread received data, synthesizes it with the next received data, and outputs it to the error detecting unit 117. The same processing as that for combining data with the next received data is repeated. Then, the despreading / compositing unit 116 resets the maintenance data at the time when the OK flag is input from the error detection unit 117, and repeats the above process again.

When an error is detected from the error detection bit of the received data transmitted from the despreading / synthesizing unit 116, the error detection unit 117 outputs an NG flag for requesting retransmission to the transmitting side to the format conversion unit 111. If no error is detected, the OK flag is output.

In this configuration, when the transmission data is transmitted from the base station apparatus 100 to the mobile station apparatus 101, it is buffered in the buffer 110 and then formatted in a predetermined format by the format conversion section 111, so that the spreading section 112 is used. Spreads from).

The spread data is modulated by the modulator 113, amplified by the variable gain amplifier 114, and transmitted from the antenna via the circulator 119.

This transmission signal is received by the antenna of the mobile station apparatus 101, is input to the demodulation unit 135 via the circulator 139, demodulated here, and then despread by the despreading / synthesizing unit 136. Spread data is maintained.

At the time of reception, when an error is detected from the error detection bit of the received data, the error detection unit 137 outputs an NG flag to make a retransmission request to the base station apparatus 100.

The base station apparatus 100 that has received the retransmission request instructs the demodulation unit 115 to retransmit the data held in the buffer 110.

In addition, in the despreading / compositing unit 136 in which the NG flag is input, the data received this time is synthesized with the previous holding data.

If no error is detected from the synthesized received data, an OK flag is output from the error detection unit 137 to the format conversion unit 131 and the despreading / compositing unit 136. As a result, the reception data is obtained, the OK flag is transmitted to the base station apparatus 100, and the data currently held in the despreading / synthesizing unit 136 is reset. In addition, the data currently held in the buffer 110 is reset.

3A is a diagram showing that the signal quality is improved by synthesizing data for each retransmission while the line condition is good. Fig. 3B is a diagram showing that the signal quality is improved by synthesizing data for each retransmission while the line state is poor. The vertical axis P represents the transmission power, and the horizontal axis T represents the time.

In addition, the broken line 151 shows the amount of transmission power required to ensure a predetermined signal quality when the line state is good. The broken line 152 indicates the amount of transmission power required to secure a predetermined signal quality when the line state is in a bad state. The broken line 151 shows a value lower than the broken line 152. This indicates that the transmission power of the better line condition is less.

At t1, the data 161 transmitted from the base station apparatus 100 to the mobile station apparatus 101 is maintained after being despread by the despreading / synthesizing section 136. At this time, if the transmission power of the base station apparatus 100 is weak and cannot be reached until the mobile station apparatus 101 secures a predetermined communication quality, in this case, the error detection unit 137 detects an error and causes the base station apparatus ( A resend request is made at 100).

The base station apparatus 100 that has received the retransmission request retransmits the same data 162 as the data 161 to the mobile station apparatus 101 at t2. The data 162 received at the mobile station apparatus 101 is combined with the data 161 already held in the despreading / synthesizing unit 136. If no error is detected from the combined received data, the OK flag is transmitted to the base station apparatus 100.

In FIG. 3B, similarly to the above, data 171 is transmitted at T1, data 172 is transmitted at T2, and data 171 and data 172 are synthesized. However, since the predetermined signal quality cannot be secured by this, an error is detected by the error detecting unit 137. Therefore, the data 173 is combined at T3 and the data 174 at T4, thereby ensuring a predetermined signal quality.

As shown in Fig. 3A, when the line state is good, the number of retransmissions is small because the transmission power for securing a predetermined communication quality is small. (In the case of Fig. 3A, the number of retransmissions is one time.)

However, as shown in Fig. 3B, when the line state is bad, the number of retransmissions increases because the transmission power for securing a predetermined communication quality is large. (In the case of Fig. 3B, the number of retransmissions is three times.)

As described above, according to the data transmission device of the first embodiment, by transmitting with a low diffusion rate, repeating the retransmission until the data is OK, synthesizing each time the retransmission, and improving the quality, as a result, the optimum diffusion rate Will be available for transmission. From this, there is no delay in reflecting the optimum rate and no need to notify the rate.

That is, since it is not necessary to determine the spread rate to a certain extent which assumes a line with a certain condition with a fixed spread rate like conventionally, a symbol rate can be raised and a transmission efficiency can be improved accordingly.

In addition, since the transmission power control for frequently transmitting the TPC command for maintaining the average quality is not necessary, the transmission efficiency can be improved as long as the control is not performed.

In addition, in order to maintain the average quality as in the related art, it is not necessary to control the transmission power, so that a dynamic region of a large demodulation system is not necessary, and transmission power can be suppressed.

(Example 2)

4 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 2 of the present invention. However, in FIG. 4, the same code | symbol as FIG. 2 is attached | subjected to the part common to FIG. 2, and the description is abbreviate | omitted.

4 differs from the error detection unit 217 of the base station apparatus 200 and the error detection unit 237 of the mobile station apparatus 201.

The error detection unit 217 (or 237), when the received data transmitted from the despreading / synthesizing unit 116 (or 136) is properly received, the number of the appropriately received data (OK packet) Number).

As described above, according to the data transmission apparatus of the second embodiment, since the OK packet number is transmitted to the transmitting side only when the received data is properly received, it is not necessary to transmit an unnecessary retransmission request signal when there are many retransmissions.

(Example 3)

Fig. 5 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 3 of the present invention. 5, the same code | symbol as FIG. 2 is attached | subjected to the part common to FIG. 2, and the description is abbreviate | omitted.

5 differs from FIG. 2 in that the channel changing unit 311 is added to the base station apparatus 300 and the channel changing unit 312 is added to the mobile station apparatus 301.

The channel changing section 311 (or 312) is connected between the error detecting section 117 (or 137) and the modulating section 113 (or 133) and, when retransmitted by the NG flag, is a channel that is a transmission medium of a signal ( For example, an instruction to change the frequency) is performed.

As described above, according to the data transmission apparatus of the third embodiment, since the channel, which is the transmission medium of the signal, is changed at the time of retransmission, a diversity effect is obtained, and it is possible to avoid the circuit from being in a low quality state for a long time during low speed fading. have. In addition, it may be executed periodically, instead of executing each time resend.

(Example 4)

6 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 4 of the present invention. 6, the same code | symbol as FIG. 2 is attached | subjected to the part common to FIG. 2, and the description is abbreviate | omitted.

6 differs from FIG. 2 in that the base station apparatus 400 and the mobile station apparatus 401 have a multicarrier transmission / reception configuration. In this example, it is assumed that the frequencies f1, f2 and F1, F2 are used.

That is, as shown in FIG. 6, the system shown in FIG. 2 is provided with two systems, and the base station apparatus 400 converts the transmission data in parallel and outputs them to the buffers 110-1 and 110-2. Serial / Parallel (S / P) conversion unit 411 and a mixing unit 412 for mixing the output signal of each of the modulators 113-1 and 113-2 and outputting them to the variable gain amplifier 114 did.

In addition, the filters 413-1 and 413-2 which pass only the frequency F1 and F2 components of the received signal passing through the circulator 119 to the demodulators 115-1 and 115-2, and despread / A P / S (Parallel / Serial) converter 414 for converting the received data from the combining units 116-1 and 116-2 in parallel and outputting the received data was provided.

Further, in the mobile station apparatus 401, an S / P converter 415 for converting the transmission data in parallel and outputting them to the buffers 130-1 and 130-2, and each of the modulators 133-1 and 133-. A mixing unit 416 for mixing the output signals of 2) and outputting them to the variable gain amplifier 134 was provided.

In addition, the filters 417-1 and 417-2 which pass only the frequency f1 and f2 components of the received signal passing through the circulator 139 and output to the demodulators 135-1 and 135-2, and despread / A P / S converter 418 for converting the received data from the combining units 136-1 and 136-2 in parallel and outputting the received data was provided.

As described above, according to the data transmission apparatus of the fourth embodiment, by using multicarrier transmission, the diversity effect is increased, high-speed transmission is possible, and the average transmission rate can be kept to some extent (multiple carriers). If there is, the number of carriers of OK is almost constant).

In addition, the success or failure of data can be determined independently for each carrier, and a high data rate can be realized in an instantaneously good line. In consideration of packet transmission, it is better to end the best packet in a shorter time with a difference in quality than to improve the average error rate.

(Example 5)

7 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 5 of the present invention. However, in FIG. 7, the same code | symbol as FIG. 6 is attached | subjected to the part common to FIG. 6, and the description is abbreviate | omitted.

7 differs from FIG. 6 in that the base station apparatus 500 and the mobile station apparatus 501 are provided with frequency selection units 511 to 514 for arbitrarily selecting and setting the frequencies of the multicarriers.

That is, the carrier frequency of the data transmitted and received by the frequency selectors 511 to 514 can be arbitrarily selected and set.

As described above, according to the data transmission apparatus of the fifth embodiment, since the carrier frequency of the transmission / reception data can be arbitrarily set, the frequency diversity effect is obtained.

(Example 6)

8 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 6 of the present invention. However, in FIG. 8, the same code | symbol as FIG. 6 is attached | subjected to the part common to FIG. 6, and the description is abbreviate | omitted.

8 differs from FIG. 6 in that the base station apparatus 600 and the mobile station apparatus 601, the Inverse Fast Fourier Transform (IFFT) units 611 and 613, and the Fast Fourier Transform (FFT) unit (FIG. And 612 and 614.

That is, in the base station apparatus 600, the IFFT unit 611 and the circulator 119 which inversely Fourier transforms the spread data from the spreading units 112-1 and 112-2 and outputs them to the variable gain amplifier 114. And a FFT unit 612 for Fourier transforming the received signal and outputting it to the despreading / synthesizing units 116-1 and 116-2.

In the mobile station apparatus 601, an IFFT unit 613 and a circulator 139 which inversely Fourier transforms the spread data from the spreading units 132-1 and 132-2 and outputs them to the variable gain amplifier 134. And a FFT unit 614 for Fourier transforming the received signal and outputting it to the despreading / synthesizing units 136-1 and 136-2.

As described above, according to the data transmission apparatus of the sixth embodiment, frequency efficiency can be improved by performing OFDM communication.

(Example 7)

9 is a block diagram showing the structure of a despreading / compositing unit of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 7 of the present invention. The despreading / synthesizing unit 700 shown in FIG. 9 is any of the despreading / synthesizing units described in the first to sixth embodiments.

The despreading / compositing unit 700 includes a despreading unit 701, a 90 degree phase rotating unit 702, a 180 degree phase rotating unit 703, a 270 degree phase rotating unit 704, and each combining unit 705 to 712, a selector 713, a first buffer 714, and a second buffer 715.

In such a configuration, after the received signal is despread by the despreader 701, the 90-degree phase rotater 702, the 180-degree phase rotater 703, and the 270-degree phase rotater 704 are rotated 90 degrees and 180 degrees. The phase is rotated by degrees and 270 degrees.

The data after the rotation is combined with the previous data held in the first buffer 714 and the second buffer 715 by the synthesis sections 705 to 712, like the non-rotation data, and the selector 713 Will be printed).

In the selector 713, the best quality data is selected, which is output as received data and held in the first buffer 110 as well. In addition, second quality data is selected, which is retained in the second buffer 715.

The data held in each of the buffers 714 and 715 is reset upon input of the OK flag.

As described above, according to the despreading / synthesizing unit of the data transmission device of the seventh embodiment, reception data close to the optimum quality can be selected by rotating and synthesizing the received data after despreading in an appropriate phase. In the synthesis method, the amplitude can be adaptively selected in addition to the phase, and further improvement in performance can be expected.

They increase hardware size as the number of selected branches increases, but performance improves.

(Example 8)

10 is a block diagram showing the structure of a despreading / compositing unit of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 8 of the present invention. The despreading / synthesizing unit 800 shown in FIG. 10 is any of the despreading / synthesizing units described in the first to sixth embodiments.

The despreading / compositing unit 800 includes a despreading unit 801, first to fourth buffers 802 to 805, coefficient generator 806, multipliers 807 to 810, 814, and addition. The part 811, the subtraction part 812, and the switch 813 are comprised.

In this configuration, the received signal is despread by the despreader 801 and then held in the first to fourth buffers 802 to 805. This maintenance is performed in the order of reception.

Each holding data is multiplied by the coefficients from the coefficient generator 806 in the multipliers 807 to 810 and 814, and all of these multiplication results are added by the adder 811. This addition data is output as received data and subtracted from the expected value by the subtraction unit 812, whereby the difference between both is output to the coefficient generation unit 806 via the switch 813.

In the coefficient generator 806, every coefficient is updated again each time a new retransmission signal is received. The old coefficients are immutable and only new coefficients are optimized. That is, the past coefficient uses the coefficient set in the past as an initial value, and the new coefficient uses 0 as an initial value, and optimizes all the coefficients again.

As described above, according to the despreading / synthesizing unit of the data transmission device of Example 8, as a method of synthesizing the received data and the retained data after despreading, the least square error is assumed to be the principle for all retransmitted signals. Since the optimum coefficients are obtained and synthesized by adaptive signal processing (LMS (Least Mean Square), RLS (Recursive Least Squares), GA (Generic Algorithm, etc.)), the received data close to the optimum quality can be obtained.

(Example 9)

Fig. 11 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus which are data transmission apparatuses according to Embodiment 9 of the present invention.

In the mobile communication system shown in FIG. 11, three users, that is, three mobile station apparatuses 901, 902 and 903, and the base station apparatus 900 correspond to the number of those mobile station apparatuses 901, 902 and 903. The transmitter / receiver unit 911, 912, 913 and a transmission antenna mounted thereon are provided.

Each mobile station apparatus 901, 902, 903 has the same configuration as the mobile station apparatus 101 of FIG. In addition, each of the transceivers 911, 912, 913 of the mobile station apparatus 900 includes a buffer 110, a format converter 111, a spreader 112, and a modulator of the base station apparatus 100 of FIG. 2. 113, the variable gain amplifier 114, the demodulation unit 115, the despreading / synthesizing unit 116, and the error detection unit 117.

That is, the base station apparatus 900 includes a transmitting antenna in each transmitting and receiving unit to communicate with the mobile station apparatuses 901, 902, and 903.

As described above, according to the data transmission apparatus of the ninth embodiment, the plurality of transmit antennas of the base station apparatus 900 can be used, and in particular, in the downlink, fading between the mobile station apparatuses 901, 902, 903 can be independently performed. This can reduce interference.

In addition, the effect can be further obtained by having a transmitting antenna equal to or larger than the number of mobile station apparatuses and transmitting from a completely different antenna for each mobile station apparatus.

(Example 10)

12 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus which are data transmission apparatuses according to Embodiment 10 of the present invention. However, in FIG. 12, the same code | symbol as FIG. 11 is attached | subjected to the part common to FIG. 11, and the description is abbreviate | omitted.

FIG. 12 differs from FIG. 11 in that the synthesizers 1011 and 1012 are provided so that specific users are grouped and transmitted by different antennas for each group.

For example, four users, that is, a mobile station apparatus having a mobile station apparatus 904 in addition to that shown in FIG. 11, and the base station apparatus 1000 corresponds to the number of those mobile station apparatuses 901, 902, 903, and 904. Transceivers 911, 912, 913, and 914, and two transmit antennas.

The combining unit 1011 synthesizes transmission data from the transmitting and receiving units 911 and 912, and the combining unit 1012 synthesizes transmission data from the transmitting and receiving units 913 and 914.

In this case, one of the base station apparatus 1000 transmits data to the two mobile station apparatuses 901 and 902 by one transmitting antenna, and the other transmitting antenna to the other two mobile station apparatuses 903 and 904. Send the data.

As described above, according to the data transmission apparatus of the tenth embodiment, by grouping specific mobile station apparatuses and transmitting them by different transmission antennas for each group, interference can be reduced, particularly when it is difficult to prepare more than the number of transmission antennas. have.

(Example 11)

Fig. 13 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus which are data transmission apparatuses according to Embodiment 11 of the present invention. In FIG. 13, parts common to those in FIG. 12 are denoted by the same reference numerals as in FIG. 11, and description thereof is omitted.

FIG. 13 differs from FIG. 12 in that the group changing unit 1101 is connected to the base station apparatus 1100 between the output side of each transmission series and the antenna, whereby the contents of grouping are retransmitted every time data is retransmitted. Is in changing the.

As described above, according to the data transmission apparatus of the eleventh embodiment, it is possible to avoid that specific mobile station apparatuses are always transmitted on the same line, thereby further reducing interference. In addition, you may perform it regularly, without making it resent every time.

(Example 12)

14 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 12 of the present invention. However, in FIG. 14, the same code | symbol as FIG. 2 is attached | subjected to the part common to FIG. 2, and the description is abbreviate | omitted.

14 differs from FIG. 2 in the base station apparatus 1200 and the mobile station apparatus 1201 between the error detection unit 117 (or 137) and the format conversion unit 111 (or 131). , 1211).

The counter 1210 (or 1211) sets the number of times for restricting the transmission of the NG flag, counts the number of transmissions of the NG flag, and stops the transmission of the NG flag when the count number reaches the set number of times.

If there is no restriction in this way, the signal of the line which is almost unavailable can be repeated forever, and it will interfere with another mobile station apparatus for a long time, In such a case, the process of a line short circuit etc. will be performed.

As described above, according to the data transmission device of the twelfth embodiment, it is possible to prevent a signal such as a repetition of retransmission of a signal of a line which is almost unavailable. In addition, there is no case of causing long-term interference to the user.

(Example 13)

Fig. 15 is a block diagram showing the configuration of a base station apparatus and a mobile station apparatus, which are data transmission apparatuses according to Embodiment 13 of the present invention. However, in FIG. 15, the same code | symbol as FIG. 2 is attached | subjected to the part common to FIG. 2, and the description is abbreviate | omitted.

15 differs from FIG. 2 in that the base station apparatus 1300 and the mobile station apparatus 1301 generate a response signal between the error detection unit 117 (or 137) and the format conversion unit 111 (or 131). The part 1310, 1311 is connected.

When the OK flag or the NG flag is received, the response signal generation unit 1310 (or 1311) returns a response signal indicating that the flag was correctly received to the source of the flag.

As described above, according to the data transmission apparatus of the thirteenth embodiment, when the OK flag or the NG flag is received, the reception response signal is returned to the transmission source, so if the flag is wrong, it is not necessary to retransmit the data, for example. There is no error in transmission / reception between transmission and reception caused by discarding or retransmitting which must be retransmitted.

As is apparent from the above description, according to the present invention, the transmission efficiency can be improved, and the transmission power can be reliably suppressed, so that the diversity performance in the transmission by multiple antennas can be improved.

This specification is based on patent application No. 2000-072715, filed March 15, 2000. Include this here.

Industrial Applicability The present invention is preferably used for a mobile telephone in a mobile communication system employing a CDMA system, a mobile station apparatus such as an information terminal apparatus having a cellular telephone function and a computer function, and a base station apparatus for wireless communication with the mobile station apparatus.

Claims (26)

delete delete delete delete delete delete Holding means for temporarily holding transmission data; Spreading means for spreading the transmission data held in said holding means at a low diffusion rate at which it is almost impossible for a signal after despreading to obtain a predetermined quality, except when the line state is in the best state at the communication counterpart; Demodulation means for holding transmission data in the holding means when a retransmission request is received from a communication partner and resetting the transmission data held in the holding means when no retransmission request is received from a communication partner; Data transmission device comprising a. delete The method of claim 7, wherein And a channel changing means for changing a channel which is a transmission medium of data at the time of retransmission by the detection of an error, or periodically. The method of claim 7, wherein A data transmission device using multicarriers for data transmission. The method of claim 10, And a frequency selecting means for arbitrarily selecting and setting a carrier frequency of transmission / reception data from the multicarrier. The method of claim 10, A data transmission device for multicarrier data after spreading with OFDM. The method of claim 7, wherein A data transmission device having a plurality of transmission antennas for transmitting data by associating one transmission antenna with each communication counterpart. The method of claim 13, A data transmission apparatus for grouping a plurality of communication partners and transmitting data by associating one transmission antenna to each of these groups. The method of claim 14, And a group changing means for changing a group corresponding to the transmitting antenna. The method of claim 7, wherein And a reply means for returning a response signal indicating that the flag indicating the error detection result can be correctly received to the sender of the flag. A mobile station apparatus having a data transmission apparatus, The data transmission device, Holding means for temporarily holding transmission data; Spreading means for spreading the transmission data held in said holding means at a low diffusion rate at which it is almost impossible for a signal after despreading to obtain a predetermined quality, except when the line state is in the best state at the communication counterpart; Demodulation means for holding transmission data in the holding means when a retransmission request is received from a communication partner and resetting the transmission data held in the holding means when no retransmission request is received from a communication partner; A mobile station apparatus having a. A base station apparatus having a data transmission apparatus, The data transmission device, Holding means for temporarily holding transmission data; Spreading means for spreading the transmission data held in said holding means at a low diffusion rate at which it is almost impossible for a signal after despreading to obtain a predetermined quality, except when the line state is in the best state at the communication counterpart; Demodulation means for holding transmission data in the holding means when a retransmission request is received from a communication partner and resetting the transmission data held in the holding means when no retransmission request is received from a communication partner; Base station apparatus having a. The transmitting side spreads and transmits the transmission data at a low diffusion rate in which the signal after despreading is almost impossible to obtain a predetermined quality except when the line state is in the best state on the receiving side. The receiving side despreads and holds the received data, and when an error is detected in the data obtained by combining the retained data with the retransmitted despreading data, makes a request for retransmission of the data to the transmitting side, The transmitting side retransmits the transmission data when the receiving side receives the retransmission request. Data transfer method. delete The method of claim 19, The receiving side notifies the transmitting side only when the received data is appropriate, and the transmitting side retransmits until receiving the appropriate notification. The method of claim 19, A data transmission method in which a transmitting side changes a channel, which is a transmission medium of data, from the previous time when retransmitting data. The method of claim 19, A data transmission method in which a multicarrier is used to transmit and receive data, and the transmitting side replaces the carrier for retransmitting data with the previous time. The method of claim 23, A data transmission method for performing multicarrier with OFDM. The method of claim 19, A data transmission method for arbitrarily limiting the number of times of retransmission of data. The method of claim 19, A data transmission method of returning to a source of a flag that a flag indicating a result of error detection can be correctly received.